We've been told that hydrogen fuel cells were going to be the next big energy revolution for years. While we're still waiting for HFC-powered cars to make an impact in the market, it looks like the power hungry gadgets in our pockets might be the first to benefit from the technology.

Upp is not technically a battery – it combines hydrogen and air to produce energy, with water vapour as a by-product. As a result it does not need to recharge, but is instead reloaded with a fresh hydrogen canister. The detachable canisters are refillable and connected to the fuel cell with powerful magnets.